Images from the 'Tarnished Earth' photo exhibition in London which opened on 14th September 2010 at City Hall. The open-air exhibition is at the London site until the 14th of October, after which date it travels to seven major cities across the UK. Sponsored by the Co-Operative Bank and in collaboration with WWF and Greenpeace, Tarnished Earth tells the story of the tarsands - an ecological and climate disaster unfolding in Alberta, Canada.